Apple has just released iOS 4.0.2 for iPhone and iOS 3.2.2 for iPad which on the surface seem only to patch the zero day, in the wild PDF rendering exploit that enabled Jailbreakme.com, but could have also potentially allowed all manner of malware attacks against the iPhone Safari browser.
At a whopping 579.3 MB for iOS 4.0.2, it does seem like there should be something more substantial in the update -- proximity sensor fix anyone? -- but if there is, Apple isn't saying.
Kudos, however, for moving at what is for Apple security, lightning speed.
If you don't care about the Jailbreakme.com, or care about potential malware exploits more, head on over to iTunes and start your download. If you notice anything else fixed or changed, let us know in comments!